package com.atguigu.gulimall.search.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.search.config.GulimallElasticSearchConfig;
import com.atguigu.gulimall.search.constant.EsConstant;
import com.atguigu.gulimall.search.feign.ProductFeignService;
import com.atguigu.gulimall.search.service.MallSearchService;
import com.atguigu.gulimall.search.vo.AttrResponseVo;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResult;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author LXG
 * @date 2022-1-6
 */
@Service
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    RestHighLevelClient client;

    @Autowired
    ProductFeignService productFeignService;

    @Override
    public SearchResult search(SearchParam param) {
        //1、动态构建出查询的DSL语句
        SearchResult result = null;

        SearchRequest searchRequest = buildSearchRequest(param);

        //2、准备检索请求
        try {

            //3、执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);

            //4、分析响应数据封装成我们需要的格式
            result = buildSearchResult(response, param);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return result;
    }

    /**
     * 准备检索请求
     *
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam param) {
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        /**
         * 模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存）
         */
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1 must -模糊匹配
        if (!StringUtils.isEmpty(param.getKeyword())) {
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", param.getKeyword()));
        }

        //1.2 bool- filter-过滤 按照三级分类过滤 term
        if (param.getCatalog3Id() != null) {
            boolQuery.filter(QueryBuilders.termQuery("catalogId", param.getCatalog3Id()));
        }
        //1.2  bool- filter-过滤 按照品牌id过滤 terms
        if (param.getBrandId() != null && param.getBrandId().size() > 0) {
            boolQuery.filter(QueryBuilders.termsQuery("brandId", param.getBrandId()));
        }
        //1.2 bool- filter-过滤 按照所有指定的属性过滤
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            //attrs=1_5寸:8寸&&attrs=2_16G:8G
            for (String attrStr : param.getAttrs()) {
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                //attr=1_5寸:8寸
                String[] s = attrStr.split("_");

                //检索属性的id
                String attrId = s[0];
                //检索属性的值
                String[] attrValues = s[1].split(":");
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrId", attrId));

                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue", attrValues));
                //每一个必须生成一个nested查询，每次循环放入
                NestedQueryBuilder nestedQueryBuilder = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQueryBuilder);
            }

        }

        //1.2 bool- filter-过滤 按照库存是否有的属性过滤
        if (param.getHasStock() != null) {
            boolQuery.filter(QueryBuilders.termQuery("hasStock", param.getHasStock() == 1));
        }

        //1.2 bool- filter-过滤 按照价格区间
        if (!StringUtils.isEmpty(param.getSkuPrice())) {
            RangeQueryBuilder skuPrice = QueryBuilders.rangeQuery("skuPrice");

            String[] s = param.getSkuPrice().split("_");
            if (s.length == 2) {
                //区间
                skuPrice.gte(s[0]).lte(s[1]);
            } else if (s.length == 1) {
                if (param.getSkuPrice().startsWith("_")) {
                    skuPrice.lte(s[0]);
                }
                if (param.getSkuPrice().endsWith("_")) {
                    skuPrice.gte(s[0]);
                }
            }
            boolQuery.filter(skuPrice);
        }

        //把以前的所有条件拿来进行封装
        sourceBuilder.query(boolQuery);
        /**
         * 排序，分页，高亮
         */
        //2.1、排序
        if (!StringUtils.isEmpty(param.getSort())) {

            String sort = param.getSort();
            //sort=hotScore_asc/desc
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0], order);
        }
        //2.2、分页 pageSize:5
        //pageNum:1 from 0 size:5
        //pageNum:2 from 5 size:5
        //from=(pageNum-1)*size
        if (param.getPageNum() == null) {
            sourceBuilder.from(0);
        } else {
            sourceBuilder.from((param.getPageNum() - 1) * EsConstant.PRODUCT_PAGESIZE);
        }
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        //2.3、高亮
        if (!StringUtils.isEmpty(param.getKeyword())) {

            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");

            sourceBuilder.highlighter(builder);
        }


        /**
         * 聚合分析
         * 任何请求都需要聚合分析
         */

        //1、品牌聚合
        TermsAggregationBuilder brandAgg = AggregationBuilders.terms("brand_agg");
        brandAgg.field("brandId").size(50);
        //品牌聚合的子聚合
        brandAgg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brandAgg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brandAgg);

        //2、分类聚合catalog_id
        TermsAggregationBuilder catalogAgg = AggregationBuilders.terms("catalog_agg");
        catalogAgg.field("catalogId").size(50);
        //分类子聚合
        catalogAgg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        sourceBuilder.aggregation(catalogAgg);


        //3、属性聚合 聚合分析出当前attr_id对应的所有名字和值
        NestedAggregationBuilder nested = AggregationBuilders.nested("attr_agg", "attrs");
        TermsAggregationBuilder attrIdAgg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId").size(50);

        attrIdAgg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        attrIdAgg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));

        nested.subAggregation(attrIdAgg);

        sourceBuilder.aggregation(nested);

        String s = sourceBuilder.toString();
        System.out.println("构建的DSL:" + s);

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);
        return searchRequest;
    }

    /**
     * 构建结果数据
     *
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response, SearchParam param) {
        SearchResult result = new SearchResult();

        //======从hit中获取=======
        //1、返回得所有查询到的商品
        SearchHits hits = response.getHits();


        if (hits.getHits() != null && hits.getHits().length != 0) {
            List<SkuEsModel> skus = new ArrayList<>();
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel sku = JSONObject.parseObject(sourceAsString, SkuEsModel.class);

                //高亮
                if (!StringUtils.isEmpty(param.getKeyword())) {
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String txt = skuTitle.getFragments()[0].string();
                    sku.setSkuTitle(txt);
                }

                skus.add(sku);
            }
            result.setProducts(skus);
        }

        //====从聚合信息中获取======
        Aggregations aggregations = response.getAggregations();

        //2、当前所有商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrs = new ArrayList<>();
        ParsedNested attrAgg = aggregations.get("attr_agg");

        ParsedLongTerms attrIdAgg = attrAgg.getAggregations().get("attr_id_agg");

        List<? extends Terms.Bucket> attrIdAggBuckets = attrIdAgg.getBuckets();

        for (Terms.Bucket attrIdAggBucket : attrIdAggBuckets) {

            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //得到属性的id
            long attrId = attrIdAggBucket.getKeyAsNumber().longValue();
            attrVo.setAttrId(attrId);

            //得到属性的名称
            ParsedStringTerms attrNameAgg = attrIdAggBucket.getAggregations().get("attr_name_agg");
            String attrName = attrNameAgg.getBuckets().get(0).getKeyAsString();
            attrVo.setAttrName(attrName);

            //得到属性的所有值
            List<String> attrValues = ((ParsedStringTerms) attrIdAggBucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {

                String v = ((Terms.Bucket) item).getKeyAsString();
                return v;
            }).collect(Collectors.toList());

            attrVo.setAttrValue(attrValues);
            attrs.add(attrVo);
        }
        result.setAttrs(attrs);


        //3、查询所有商品涉及到的所有品牌信息
        ParsedLongTerms brandAgg = aggregations.get("brand_agg");
        List<SearchResult.BrandVo> brands = new ArrayList<>();

        List<? extends Terms.Bucket> brandAggBuckets = brandAgg.getBuckets();
        for (Terms.Bucket bucket : brandAggBuckets) {

            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //获取品牌id
            long brandId = bucket.getKeyAsNumber().longValue();
            brandVo.setBrandId(brandId);

            //获取品牌名称
            ParsedStringTerms brandNameAgg = bucket.getAggregations().get("brand_name_agg");
            String brandName = brandNameAgg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brandName);

            //获取品牌图片
            ParsedStringTerms brandImgAgg = bucket.getAggregations().get("brand_img_agg");
            String brandImg = brandImgAgg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandImg(brandImg);

            brands.add(brandVo);
        }
        result.setBrands(brands);

        //4、当前所有商品涉及到的所有分类信息
        List<SearchResult.CatalogVo> catalogs = new ArrayList<>();
        ParsedLongTerms catalogAgg = aggregations.get("catalog_agg");
        List<? extends Terms.Bucket> buckets = catalogAgg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到的分类id
            long catalogId = bucket.getKeyAsNumber().longValue();
            catalogVo.setCatalogId(catalogId);
            ParsedStringTerms catalogNameAgg = bucket.getAggregations().get("catalog_name_agg");
            String catalogName = catalogNameAgg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalogName);
            catalogs.add(catalogVo);
        }
        result.setCatalogs(catalogs);

        //5、分页信息页码
        result.setPageNum(param.getPageNum() == null ? 1 : param.getPageNum());
        //6、分页信息-总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
        //7、分页信息总页码
        int totalPages = total % EsConstant.PRODUCT_PAGESIZE == 0 ? (int) total / EsConstant.PRODUCT_PAGESIZE : (int) (total / EsConstant.PRODUCT_PAGESIZE + 1);
        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);
        //6、构建面包屑导航功能
        if (param.getAttrs() != null && param.getAttrs().size() != 0) {

            List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr -> {

                SearchResult.NavVo navVo = new SearchResult.NavVo();
                //attrs=2_5寸:6寸
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);

                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    AttrResponseVo respVo = r.getData("attr", new TypeReference<AttrResponseVo>() {
                    });
                    navVo.setNavName(respVo.getAttrName());
                } else {
                    navVo.setNavName(s[0]);
                }
                //2、取消了这个面包屑后，我们要跳转到那个地方，将请求的url里面的当前置空

                String replace = replaceQueryString(param, attr, "attrs");
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);

                return navVo;
            }).collect(Collectors.toList());
            result.setNavs(collect);
        }



        //品牌分类
        if (param.getBrandId() != null && param.getBrandId().size() > 0) {

            List<SearchResult.NavVo> navs = new ArrayList<>();

            R r = productFeignService.brandsInfo(param.getBrandId());
            if (r.getCode() == 0) {
                List<SearchResult.BrandVo> brand = r.getData("brand", new TypeReference<List<SearchResult.BrandVo>>() {
                });
                StringBuffer buffer = new StringBuffer();
                String replace = "";
                for (SearchResult.BrandVo brandVo : brand) {
                    buffer.append(brandVo.getName() + ";");
                    replace = replaceQueryString(param, brandVo.getBrandId() + "", "brandId");
                }
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
                navs.add(navVo);
            }
            result.setNavs(navs);
        }


        //TODO 分类，不需要导航取消

        return result;

    }

    private String replaceQueryString(SearchParam param, String value, String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            //浏览器对空格编码和JAVA不一样
            encode.replace("+", "%20");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return param.get_queryString().replace("&" + key + "=" + encode, "");
    }

}
